soc: arc: fix ARC_HAS_ACCL_REGS settings

ARC_HAS_ACCL_REGS should set to y to protect ACCL and ACCH registers
during irq. These registers could be used as GPRs by compilers and
therefore need store/restore during irq.

Signed-off-by: Yuguo Zou <yuguo.zou@synopsys.com>