ANDROID: android: Create debug_symbols driver

Introduce new API to expose symbols useful for debugging the GKI kernel.
Symbols exported from this driver would be difficult to maintain via the
traditional EXPORT_SYMBOL_GPL.

Bug: 199236943
Signed-off-by: Elliot Berman <eberman@codeaurora.org>
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Yogesh Lal <ylal@codeaurora.org>

Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.com>
[ delete some unused symbols and add _text/_end ]

The commit bb732365 had build error,
so it was reverted. After fixed build error, restore the commit.

Bug: 287890135
Change-Id: I95bc8f4203791d6857e126d87519b892c81057b0
Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.com>