drivers: memc_nxp_s32_qspi: change DT_REG_ADDR to DT_REG_ADDR_RAW

Following the commit f98fde07, DT_REG_ADDR now expands with a 'U'
suffix as an unsigned value. However, for compatibility with IS_EQ,
a raw value without any suffix is required. Therefore, this update is
necessary.

Signed-off-by: Cong Nguyen Huu <cong.nguyenhuu@nxp.com>