Incorrect mapping alignement in renderer

[Zeng-Zer]

The following error is constantly printed:

Validation:  [ VUID-VkMappedMemoryRange-size-01390 ] Object: 0x2b (Type = 8) | vkFlushMappedMemoryRanges: Size in pMemRanges[0] is 0x18, which is not a multiple of VkPhysicalDeviceLimits::nonCoherentAtomSize (0x40). The Vulkan spec states: If size is not equal to VK_WHOLE_SIZE, size must either be a multiple of VkPhysicalDeviceLimits::nonCoherentAtomSize, or offset plus size must equal the size of memory. (https://www.khronos.org/registry/vulkan/specs/1.1-extensions/html/vkspec.html#VUID-VkMappedMemoryRange-size-01390)

[Gaspard--]

There is a possibility it would make more sense to resolve this in https://github.com/raven-os/magma