Platform/Ampere: Add scripts to help building and flashing firmware

Add scripts which help users to build and flash firmware images for
platforms based on the Ampere Altra SoC.

'buildfw.sh' can be used to build images containing just UEFI, or if
the TF-A (ATF) binary is present TF-A + UEFI and complete 32MB SPI-NOR
images. If the SYS (SMPro and PMPro microprocessors) binary is also
present then a capsule update file for the SYS/SCP component of the SOC
will also be built. Usage:

Usage:
  ./Platform/Ampere/buildfw.sh [options]

Options:
  -b <bldtype>, --build <bldtype>  Specify the build type: DEBUG or
                                   RELEASE
  -t <tc>, --toolchain <tc>        Specify the toolchain to use: GCC or
                                   CLANG
  -m <mfg>, --manufacturer <mfg>   Specify platform manufacturer
                                   (e.g. Ampere)
  -p <plat>, --platform <plat>     Specify platform to build (e.g. Jade)
  -l <kern>, --linuxboot <kern>    Build LinuxBoot firmware instead of
           full EDK2 with UEFI Shell, specifying path to flashkernel
  -f, --flash                      Copy firmware to BMC and flash
           firmware (keeping EFI variables and NVPARAMs) after building
  -F, --full-flash                 Copy firmware to BMC and flash full
           EEPROM (resetting EFI variables and NVPARAMs) after building

  Note: flash options require bmc.sh file with env vars BMC_HOST, BMC_USER and BMC_PASS defined

  Available manufacturers:
    ADLINK
    Ampere
    ASRockRack

  Available platforms:
    ADLINK     -> ComHpcAlt
    Ampere     -> Jade
    ASRockRack -> Altrad8ud2

'fwver.sh' is used by buildfw.sh to keep track of the number of builds
done, so that firmware files of the format e.g.
comhpcalt_uefi_2024-10-22-5.bin are created along with displaying the
date including build number during boot.

'fwflash.sh' automates flashing the host firmware when the target
system is running a BMC with OpenBMC. 'fwflash.exp' is a helper
script used by 'fwflash.sh' to ssh into the BMC and run the
ampere_flash_bios.sh utility. Usage:

Copies firmware to the BMC (running OpenBMC) and runs
               ampere_flash_bios.sh to flash the host.
Usage:
  fwflash.sh [options] <Host firmware file>

Options:
  -f, --full   Flash the entire SPI-NOR chip (default)
  -c, --code   Flash the code (TF-A + UEFI) area
  -t, --tfa    Flash the TF-A (ATF) area
  -u, --uefi   Flash the UEFI area
  -h, --help   This help message

Note: TF-A (Trusted Firmware for ARMv8-A) is the same as ATF
      (ARM Trusted Firmware).

Signed-off-by: Rebecca Cran <rebecca@bsdio.com>