ARC: Implement .note.ABI-tag section in crt1.S
ARC: Implement .note.ABI-tag section in crt1.S

Linux Standard Base specifies section .note.ABI-tag that can be considered
as a marker for ELF files targeted to Linux systems. See
https://refspecs.linuxfoundation.org/LSB_1.2.0/gLSB/noteabitag.html

This section, for example, is used by the GDB to identify Linux ELFs as
compared to baremetal ELFs that do not have this section.

Signed-off-by: Anton Kolesov <6d46fa21eecc5e9fc7d28ab2b113a82bcda0d8ca@synopsys.com>
Cc: Vineet Gupta <bd05ca6cff4fa9f3083b4f5f4cfd92a96f3c3adb@synopsys.com>

kraj/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,brgl/uclibc-ng,wbx-github/uclibc-ng,brgl/uclibc-ng,wbx-github/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,brgl/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,wbx-github/uclibc-ng,kraj/uclibc-ng,kraj/uclibc-ng,wbx-github/uclibc-ng,brgl/uclibc-ng,kraj/uclibc-ng