NuttX: Retire CONFIG_ARCH_RV32IM and CONFIG_ARCH_RV64GC (#3717)

These symbols had been removed from NuttX in 2022, so it's time to
remove references to them.

product-mini/platforms/nuttx/CMakeLists.txt

@@ -18,9 +18,9 @@ elseif(CONFIG_ARCH_X86_64)
   set(WAMR_BUILD_TARGET X86_64)
 elseif(CONFIG_ARCH_XTENSA)
   set(WAMR_BUILD_TARGET XTENSA)
-elseif(CONFIG_ARCH_RV64GC OR CONFIG_ARCH_RV64)
+elseif(CONFIG_ARCH_RV64)
   set(WAMR_BUILD_TARGET RISCV64)
-elseif(CONFIG_ARCH_RV32IM OR CONFIG_ARCH_RV32)
+elseif(CONFIG_ARCH_RV32)
   set(WAMR_BUILD_TARGET RISCV32)
 elseif(CONFIG_ARCH_SIM)
   if(CONFIG_SIM_M32 OR CONFIG_HOST_X86)

product-mini/platforms/nuttx/wamr.mk

@@ -21,12 +21,6 @@ else ifeq ($(CONFIG_ARCH_X86_64),y)
 WAMR_BUILD_TARGET := X86_64
 else ifeq ($(CONFIG_ARCH_XTENSA),y)
 WAMR_BUILD_TARGET := XTENSA
-# RV64GC and RV32IM used in older
-# version NuttX
-else ifeq ($(CONFIG_ARCH_RV64GC),y)
-WAMR_BUILD_TARGET := RISCV64
-else ifeq ($(CONFIG_ARCH_RV32IM),y)
-WAMR_BUILD_TARGET := RISCV32
 else ifeq ($(CONFIG_ARCH_RV64),y)
 WAMR_BUILD_TARGET := RISCV64
 else ifeq ($(CONFIG_ARCH_RV32),y)