Add ABL-compliant pvmfw pre-built

Add a centralised pre-built binary of pvmfw with Android Boot header
obtained from the Android build system:

    https://ci.android.com/builds/submitted/7757352/u-boot_pvmfw/latest/pvmfw.img

This will provide a default image for devices that don't provide one.

Bug: 199717422
Test: -
Change-Id: Ia1e996bcd5ef198f3f1d4abed41bfde5a303bfce
diff --git a/pvmfw/pvmfw.img b/pvmfw/pvmfw.img
new file mode 100644
index 0000000..317821f
--- /dev/null
+++ b/pvmfw/pvmfw.img
Binary files differ