crypto/fsl: Differentiate between CAAM and DCP in Kconfig entry

Differentiate between "Enable Random Number Generator support" and
"Enable Random Number Generator support" in Kconfig entry, mark the
first as CAAM and the second as DCP, otherwise users cannot easily
decide which of the options is which and enable the correct one.

Signed-off-by: Marek Vasut <marex@denx.de>