base.bbclass: Combine all checksum.ini files found in BBPATH
base.bbclass: Combine all checksum.ini files found in BBPATH

This makes it possible for overlays to have checksum.ini.

Signed-off-by: Petri Lehtinen <ded098e9a5465cb2f969d4bc09b4ab7ed3e4945d@inoi.fi>
Acked-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>
Acked-by: Denys Dmytriyenko <e7d361c7f6c045f0c4fa54d2afc4a237f30bc767@denix.org>
Acked-by: Chris Larson <8cf06b7089d5169434d5def8b2d1c9c9c95f6e71@kergoth.com>
Acked-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>

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