Merge branch 'marka_arm_calling_convention' into 'master'

Use aapcs-vfp calling convention for ARMv7A

This is required to match the calling convention specified in
vk_platform.h. Tests using functions with float parameters were failing
when built for 32-bit ARM since the values were in different registers
than expected.

In particular, most of the dEQP-VK.dynamic_state.* tests were failing since the driver was seeing incorrect parameter values.

See merge request !331