arm64: versal: fix dfu alt buffer clearing

The set_dfu_alt_info() function calls the ALLOC_CACHE_ALIGN_BUFFER()
macro to declare a `buf' variable pointer into an array allocated on the
stack. It then calls the memset() function to clear the useable portion
of the array using the idiomatic expression `sizeof(buf)'.

While this would indeed work fine for an array, in the present case we
end up clearing only the size of a pointer.
Fix this by specifying the explicit size `DFU_ALT_BUF_LEN' instead.

Fixes: 064c8978b44f ("arm64: versal: Enable capsule update (SD)")
Signed-off-by: Vincent Stehlé <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Tom Rini <[email protected]>
Acked-by: Padmarao Begari <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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