initvals: add a script for simplifying checksum verification
initvals: add a script for simplifying checksum verification

The script helps to verify checksum values between the
atheros and ath9k initvals.

screenshot:
./verify_checksums.sh
ar5008         12f508dd13320697291eacdd276888188ff0bd1c pass
ar9001         b3489b0d3d7e5a20496a133cc36a1c47e42b28f4 pass
ar9002         908154dbc2a659809a32a23f3ee124afd5d20901 pass
ar9003-2p2     52159266be9751dd2fac9e47c92bb3507c5d5a1d pass
ar9330-1p1     3ce64df7a3121eab71a13ba9c8e9d9075ab9bae5 pass
ar9330-1p2     0b90668b470a08b3ae3c24fb3924c7d4401debe7 pass
ar9485         1d4011e162d8349a0b4f2a9dfab86e306ad33cc0 pass
ar9580-1p0     2364145b178ff42b8c5b14879feabd3cda2ca4d3 pass

$ ./verify_checksums.sh  ar5008
ar5008         12f508dd13320697291eacdd276888188ff0bd1c pass
$ vi ar5416.ini
$ ./verify_checksums.sh  ar5008
ar5008         b0df6fd03e1c677d9701524a8eed46d02497ef3d fail
+0x00000000aa44d980        ar5416Modes
+0x000000004d845983        ar5416Common
+0x00000000009fa667        ar5416Addac
$

Signed-off-by: Gabor Juhos <0b85b0feb94c9a44e8676965f48a70291ba74edb@openwrt.org>

qca/qca-swiss-army-knife,mcgrof/qca-swiss-army-knife,qca/qca-swiss-army-knife,qca/qca-swiss-army-knife,qca/qca-swiss-army-knife