tc4: Add support to build tc4-fpga

FIP image need to be loaded to ram to boot tc4 fpga so
enable TC_FPGA_FIP_IMG_IN_RAM by default for tf-a build.
Also, enable Android images booting from RAM default due
to slow and untested Android MMC boot.

DPU works only with fixed clock so disable TC_DPU_USE_SCMI_CLK
by default.

TC4 FPGA boots with dual stage SCP similar to TC3 right
now so define SCP_BL2 for tf-a build.

Android crashes with MTE enabled so add arm64.nomte bootarg.

Disable KVM(kvm-arm.mode=none bootarg) as DPU SMMU-700 is not
functional yet and to avoid performance hit.

Signed-off-by: Jagdish Gediya <jagdish.gediya@arm.com>