When installing boot blocks into an Alpha BSD label, setup the location, length, and flags fields at the end of the SRM boot sector so that SRM can find the bootstrap code.  This fixes bsdlabel -m alpha to generate bootable disklabels.
When installing boot blocks into an Alpha BSD label, setup the location,
length, and flags fields at the end of the SRM boot sector so that SRM can
find the bootstrap code.  This fixes bsdlabel -m alpha to generate bootable
disklabels.

Reviewed by:	phk

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