Extract public key ID from cert

Extracts keyid inline using openssl commands.
The keyid is passed as one of the kernel command line parameters
for the dm-android-verity module to mount root fs(system)
with verity enabled.

BUG: 28384658
Change-Id: I8efbe1b0e415ef1d396f9b51cfa4b3fa01b22484
1 file changed