drivers: QMSI SOC flash: simplify driver reentrancy code using IS_ENABLED

This is one the series patches that simplifies the driver code by
using the IS_ENABLED macro. This removes the need of the const
variable and the wrapper functions on semaphore APIs.

Jira: ZEP-1251

Change-Id: I59802cf9f482337656b0fdc4b272f3b1ddc6cbda
Signed-off-by: Kuo-Lang Tseng <kuo-lang.tseng@intel.com>