Platform/RaspberryPi/RPi4: drop Cortex-A53 erratum workaround

The Raspberry Pi4 uses Cortex-A72 cores so it has no need for the
Cortex-A53 ADRP erratum workaround.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>

Platform/RaspberryPi/RPi4/RPi4.dsc

@@ -241,7 +241,6 @@
   GCC:*_*_*_ASLPP_FLAGS       = -DRPI_MODEL=4
   GCC:*_*_*_ASLCC_FLAGS       = -DRPI_MODEL=4
   GCC:*_*_*_VFRPP_FLAGS       = -DRPI_MODEL=4
-  GCC:*_*_AARCH64_DLINK_FLAGS = -Wl,--fix-cortex-a53-843419
   GCC:RELEASE_*_*_CC_FLAGS    = -DMDEPKG_NDEBUG -DNDEBUG
 
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