Set oem_fingerprint_properties only when it is not empty.

Add oem_fingerprint_properties to misc_info.txt only when it is not empty.
Shamu does not have OEM specific OTA config and oem_fingerprint_properties
does not need to be set in misc_info.txt.

For sprout, it stays the same.

Bug: 16635599
Change-Id: I7e6c6f5ce1f94f8f1b6da0c2f56bc67ff9fc0f1c
1 file changed