[U-Boot] Proposed fastboot changes

[Douglas Zobel]

I've made some changes to the fastboot handlers to meet my needs.  If there
is interest, I can prepare patches and submit them upstream.  The changes
are:

BUGFIX:  Currently the 'fastboot format [partition]' command (run from PC)
formats the partition smaller than expected.  Change
getvar_partition_size() to return partition size in # of bytes instead of
the current behavior of # of blocks.  The 'fastboot format [partition]'
command expect u-boot to return the size in number of bytes in order to
format the partition correctly.

Make the a fastboot oem command handler with a dynamic lookup like the base
fastboot command handler currently is.  This would allow easily adding new
oem commands in the baseline software (such as below).  It would also allow
for board files to extend the oem handler to handle OEM specific cases.  I
would use a weakly defined default oem command handler (empty function)
which a board file can optionally override to handle board specific
commands.

Currently the 'fastboot oem format' command (gpt write mmc # $partitions)
is supported.  I'd like to add a 'fastboot oem verify' (gpt verify mmc #
$partitions) to help the flashing PC detect when a board needs to be
re-formatted.

-Doug

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