Revert "[AMDGPU] Don’t marke the .note section as ALLOC"

This reverts commit 977cd661.

It breaks OpenCL testing. OpenCL Runtime is using PT_LOAD information
to calculate memory for global variables. This commit should be relanded once
the OpenCL runtime stops relying on PT_LOAD information for calculating global
variable memory size.

Differential Revision: https://reviews.llvm.org/D74995