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>

drivers/char/hw_random/Kconfig

@@ -555,6 +555,7 @@ config HW_RANDOM_ARM_SMCCC_TRNG
 config HW_RANDOM_CN10K
        tristate "Marvell CN10K Random Number Generator support"
        depends on HW_RANDOM && PCI && (ARM64 || (64BIT && COMPILE_TEST))
+       default HW_RANDOM if ARCH_THUNDER
        help
 	 This driver provides support for the True Random Number
 	 generator available in Marvell CN10K SoCs.