compiler: arcmwdt: Remove unsupported compile flags (-fno-pic, -fno-pie)
compiler: arcmwdt: Remove unsupported compile flags (-fno-pic, -fno-pie)

Clang version used by ARCMWDT does not support -fno-pic and -fno-pie
flags.
Flags were added into arcmwdt branch by
commit 8259931fce1b ("xcc-clang: Do not used unavailable options").
Initially they were set in common CMakeLists.txt via
zephyr_cc_option() function, which filtered them out, and they
did not used in builing process.

Signed-off-by: Nikolay Agishev <6c2929e41328162725e2d4b78c7f0e5ee539d0f4@synopsys.com>

zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr