Add FIRMWARE_URIS entries for DEV_AB and DEV_B7

Without these entries `validity-sensors-firmware` crashes with a
KeyError for users on 138a:00ab and 06cb:00b7 who follow the README's
standard install flow. The 0xd51-family chips ship with firmware
pre-loaded so the downloader is only needed for factory-reset chips,
but the script should not crash.

Both PIDs point at HP softpaq sp135736.exe (the same blob extracted
to 6_07f_hp_cmit_mis_qm.xpfwext in FIRMWARE_NAMES). sha512 verified
against the canonical ftp.hp.com URL.

Reported by a 06cb:00b7 user on PR uunicorn#256.

Author: SimpleX-T

validitysensor/firmware_tables.py

@@ -22,6 +22,16 @@
         'driver': 'https://download.lenovo.com/pccbbs/mobiles/nz3gf07w.exe',
         'referral': 'https://download.lenovo.com/pccbbs/mobiles/nz3gf07w.exe',
         'sha512': 'a4a4e6058b1ea8ab721953d2cfd775a1e7bc589863d160e5ebbb90344858f147d695103677a8df0b2de0c95345df108bda97196245b067f45630038fb7c807cd'
+    },
+    SupportedDevices.DEV_AB: {
+        'driver': 'https://ftp.hp.com/pub/softpaq/sp135501-136000/sp135736.exe',
+        'referral': 'https://support.hp.com/us-en/drivers',
+        'sha512': 'f9a91e2796a5070f1f40099e2318aa9716e2e6a31b9ba6a93986c450eedbfb0b323dff55c5e4536466946da3e01985f367b1db27bbd7b65f4c333ce0cd47b78c'
+    },
+    SupportedDevices.DEV_B7: {
+        'driver': 'https://ftp.hp.com/pub/softpaq/sp135501-136000/sp135736.exe',
+        'referral': 'https://support.hp.com/us-en/drivers',
+        'sha512': 'f9a91e2796a5070f1f40099e2318aa9716e2e6a31b9ba6a93986c450eedbfb0b323dff55c5e4536466946da3e01985f367b1db27bbd7b65f4c333ce0cd47b78c'
     }
 }