misc: remove unneeded stdint.h and stdbool.h
misc: remove unneeded stdint.h and stdbool.h

All the necessary platform defines/includes are now part of
vk_platform.h, so don't need them in vk_icd.h

KhronosGroup/Vulkan-Headers,KhronosGroup/Vulkan-Headers,KhronosGroup/Vulkan-Headers