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>

Bug: 287890135
Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.com>
[ delete some unused symbols and add _text/_end ]
Change-Id: I1cadb409289ca9ce36b0084efc9ac46f6bec6741