ti: AM437x: Use generic EEPROM detection logic

ti: AM437x: Use generic EEPROM detection logic

Now that we have a generic TI eeprom logic which can be reused across
platforms, reuse the same.

This revision also includes fixes identified by Dave Gerlach
<[email protected]>

Cc: Dave Gerlach <[email protected]>
Signed-off-by: Nishanth Menon <[email protected]>
Signed-off-by: Steven Kipisz <[email protected]>
Signed-off-by: Lokesh Vutla <[email protected]>
Reviewed-by: Tom Rini <[email protected]>