[lldb][elf-core][ARM] Add support for VFP registers (#155956)

This patch loads values of the VFP registers from the NT_ARM_VFP note.

Note that a CORE/NT_FPREGSET note is typically present in core dump
files and is used to store the FPA registers. The FPA unit is rare and
obsolete; however, Linux creates the note even if the unit is absent.

GitOrigin-RevId: 8ec4d87550c01b06a9841014d901146874688894