layers: Add push descriptor set layout create VUID

layers: Add push descriptor set layout create VUID

Add VUID checks to vkCreateDescriptorSetLayout for push descriptor sets.
Additional checks include:

VALIDATION_ERROR_05000230  VkDescriptorSetLayoutCreateInfo-flags-00280
VALIDATION_ERROR_05000232  VkDescriptorSetLayoutCreateInfo-flags-00281

Also added check for use of
VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR when the
required extension VK_KHR_push_descriptor is not enabled.

Updated CreateDescriptorSetBindingWithIgnoredSamplers test, which
violated the above check.

Change-Id: Ie009019bbb7859553df92473796a1a929a9464f7