drivers: flash_handlers fixes stray semicolon
drivers: flash_handlers fixes stray semicolon

z_vrfy_flash_get_page_count defined as a function prototype in place of
a real function due to a stray semicolon.

Signed-off-by: Andrei Gansari <f1330555a90b7a22d81843f3c4366f58b50eae34@nxp.com>

nashif/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,finikorg/zephyr,finikorg/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,Vudentz/zephyr,nashif/zephyr,Vudentz/zephyr,Vudentz/zephyr,Vudentz/zephyr,galak/zephyr,galak/zephyr,nashif/zephyr,galak/zephyr,galak/zephyr,Vudentz/zephyr