ARM: mali400: r4p0_rel0: fix build errors

ARM: mali400: r4p0_rel0: fix build errors

Now occurs below build errors with -Werror=date-time. Remove code using
__DATE__ and __TIME__ to fix build errors.

drivers/gpu/arm/mali400/r4p0_rel0/linux/mali_kernel_linux.c: In function 'mali_module_init':
drivers/gpu/arm/mali400/r4p0_rel0/linux/mali_kernel_linux.c:338:71: error: macro "__DATE__" might prevent reproducible builds [-Werror=date-time]
  MALI_DEBUG_PRINT(2, ("Compiled: %s, time: %s.\n", __DATE__, __TIME__));
                                                                       ^
drivers/gpu/arm/mali400/r4p0_rel0/linux/mali_kernel_linux.c:338:1: error: macro "__TIME__" might prevent reproducible builds [-Werror=date-time]
  MALI_DEBUG_PRINT(2, ("Compiled: %s, time: %s.\n", __DATE__, __TIME__));

Change-Id: I3cb0d55619afdffee618b2ae84c9b5c600aae196
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>