hwrng: cn10k - Enable by default CN10K driver if Thunder SoC is enabled

Before commit addea585 ("hwrng: Kconfig - Do not enable by default
CN10K driver") the Marvell CN10K Random Number Generator was always
enabled when HW_RANDOM was enabled.

This was changed with that commit to prevent having this driver being
always enabled on arm64. To prevent introducing regression with some old
defconfig enable the driver when ARCH_THUNDER is enabled.

Fixes: addea585 ("hwrng: Kconfig - Do not enable by default CN10K driver")
Closes: https://lore.kernel.org/all/SN7PR18MB53144B37B82ADEEC5D35AE0CE3AC2@SN7PR18MB5314.namprd18.prod.outlook.com/


Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>