ASoC: Intel: KeemBay: Fix header guard

Clang warns:

 In file included from sound/soc/intel/keembay/kmb_platform.c:14:
 sound/soc/intel/keembay/kmb_platform.h:9:9: warning: 'KMB_PLATFORM_H_'
 is used as a header guard here, followed by #define of a different
 macro [-Wheader-guard]
 #ifndef KMB_PLATFORM_H_
         ^~~~~~~~~~~~~~~
 sound/soc/intel/keembay/kmb_platform.h:10:9: note: 'KMB_PLATFORMP_H_'
 is defined here; did you mean 'KMB_PLATFORM_H_'?
 #define KMB_PLATFORMP_H_
         ^~~~~~~~~~~~~~~~
         KMB_PLATFORM_H_
 1 warning generated.

Fix the typo so that the header guard works as intended.

Fixes: c5477e96

 ("ASoC: Intel: Add KeemBay platform driver")
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Cc: Sia, Jee Heng <jee.heng.sia@intel.com>; alsa-devel@alsa-project.org; linux-kernel@vger.kernel.org; clang-built-linux@googlegroups.com; Nathan Chancellor <natechancellor@gmail.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1053
To: Rojewski, Cezary <cezary.rojewski@intel.com>; Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>; Liam Girdwood <liam.r.girdwood@linux.intel.com>; Jie Yang <yang.jie@linux.intel.com>; Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20200617010232.23222-1-natechancellor@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>