Hisilicon/RX8900RealTimeClockLib: remove superfluous instance init steps

RealTimeClockLib instances are consumed by edk2's
EmbeddedPkg/RealTimeClockRuntimeDxe driver. In its entry point function
InitializeRealTimeClock(), the driver:

(1) calls LibRtcInitialize(),

(2) sets the GetTime(), SetTime(), GetWakeupTime() and SetWakeupTime()
    runtime services to its own similarly-named functions -- where those
    functions wrap the corresponding RealTimeClockLib APIs,

(3) installs EFI_REAL_TIME_CLOCK_ARCH_PROTOCOL with a NULL protocol
    interface.

Steps (2) and (3) conform to PI v1.8 sections II-9.7.2.4 through
II-9.7.2.7.

However, this means that LibRtcInitialize() (of any RealTimeClockLib
instance) should not itself (a) set the GetTime(), SetTime(),
GetWakeupTime() and SetWakeupTime() runtime services, nor (b) install
EFI_REAL_TIME_CLOCK_ARCH_PROTOCOL. The runtime service pointers will be
overwritten in step (2) anyway, and step (3) will uselessly install a
second (NULL-interface) EFI_REAL_TIME_CLOCK_ARCH_PROTOCOL instance in the
protocol database. (The protocol only serves to notify the DXE Foundation
about said runtime services being available.)

Clean up Hisilicon/RX8900RealTimeClockLib accordingly.

(Note that the lib instance INF file already does not list
UefiBootServicesTableLib, UefiRuntimeServicesTableLib, and
gEfiRealTimeClockArchProtocolGuid.)

Note that this patch is *untestable* in edk2-platforms (and in
edk2-non-osi too), because no platform consumes RX8900RealTimeClockLib --
worse, there hasn't been a single consumer since the introduction of the
lib instance in commit de704335 ("Silicon/Hisilicon: Add
RX8900RealTimeClockLib", 2020-05-20).

Normally this would nominate RX8900RealTimeClockLib to the axe, but commit
de704335 said, "There are some boards base on D06, but use RX8900 RTC,
so upstream the RX8900RealTimeClockLib", so I guess there might be
out-of-tree / proprietary consumers. Quite unfortunate.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Wenyi Xie <xiewenyi2@huawei.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=4565


Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20231020121903.44986-5-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>