feat(qemu): Use common platform support

Apart from a couple configuration variables, QEMU doesn't need special
platform support anymore, and can use the common arm platform code.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Change-Id: Ic3368375d35a2e4c0bc4152a5ea6ba2bb96eaf86

configs/qemu_virt_defcfg.cmake

@@ -6,42 +6,19 @@
 #
 # Set the RMM_PLATFORM variable to Cmake cache.
 #
-set(RMM_PLATFORM "qemu" CACHE STRING "platform")
+set(RMM_PLATFORM "arm" CACHE STRING "platform")
 arm_config_option_override(NAME RMM_TOOLCHAIN DEFAULT "gnu")
 
-#
-# Width of the virtual address space for the system.
-#
-arm_config_option_override(NAME VIRT_ADDR_SPACE_WIDTH DEFAULT 38)
-
 #
 # Set RMM_MAX_SIZE for this platform (24MB)
 #
 arm_config_option_override(NAME RMM_MAX_SIZE DEFAULT 0x01800000)
 
-#
-# UART Base address. This must be dynamically discovered in future.
-# Use NS UART.
-#
-arm_config_option_override(NAME RMM_UART_ADDR DEFAULT 0x09000000)
-
-#
-# Extra memory regions needed by this platform: one region for UART.
-#
-arm_config_option_override(NAME PLAT_CMN_EXTRA_MMAP_REGIONS DEFAULT 1)
-
-#
 # Maximum number of translation tables allocated by the runtime context
 # for the translation library.
 #
 arm_config_option_override(NAME PLAT_CMN_CTX_MAX_XLAT_TABLES DEFAULT 7)
 
-#
-# Disable FPU/SIMD usage in RMM for now. Enabling this causes the Realm guest
-# boot to hang, and needs to be investigated.
-#
-arm_config_option_override(NAME RMM_FPU_USE_AT_REL2 DEFAULT OFF)
-
 #
 # Maximum number of granules supported.
 #