soc: snps: nsim: arc_v: rmx/rhx: drop hardcoded MWDT flags

- Remove SoC-level ccac core/ISA flags (-av5r*, -Z*)
- Depend on arcmwdt toolchain to derive flags from Kconfig
- Keep SOC linker script selection unchanged

Signed-off-by: Afonso Oliveira <afonsoo@synopsys.com>

Author: AFOliveira

soc/snps/nsim/arc_v/rhx/CMakeLists.txt

@@ -1,12 +1,3 @@
 # SPDX-License-Identifier: Apache-2.0
 
-if(COMPILER STREQUAL arcmwdt)
-# CCAC:
-  zephyr_compile_options(-av5rhx -Zicsr -Zifencei -Zihintpause -Zba -Zbb
-                         -Zbc -Zbs -Zca -Zcb -Zcmp -Zcmt -Za -Zm  -Zc
-                         -Zicond -Zicbom -Zicbop)
-
-  zephyr_ld_options(-av5rhx)
-endif()
-
 set(SOC_LINKER_SCRIPT ${ZEPHYR_BASE}/include/zephyr/arch/riscv/common/linker.ld CACHE INTERNAL "")

soc/snps/nsim/arc_v/rmx/CMakeLists.txt

@@ -1,11 +1,3 @@
 # SPDX-License-Identifier: Apache-2.0
 
-if(COMPILER STREQUAL arcmwdt)
-# CCAC:
-  zephyr_compile_options(-av5rmx -Zicsr -Zifencei -Zihintpause -Zba -Zbb
-                         -Zbs -Zca -Zcb -Zcmp -Zcmt -Za -Zm -Zicbom)
-
-  zephyr_ld_options(-av5rmx)
-endif()
-
 set(SOC_LINKER_SCRIPT ${ZEPHYR_BASE}/include/zephyr/arch/riscv/common/linker.ld CACHE INTERNAL "")