debug_menu: show 2nd SD/MMC card info only if NUM_DRIVES > 1
Toggling to the second card was allowed if HAVE_HOTSWAP
was defined, but on targets with a single hotswappable
SD card -- for example many JZ47xx/X1000 targets -- this
ends up calling card_get_info() on a non-existent drive.
A slightly better option is to check if NUM_DRIVES is
greater than 1. This is still just guessing the number
of SD/MMC slots, but it should be wrong in fewer cases.
Change-Id: Ifca29323f1c7091d9cce55c73147d0d1decae9a5
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