crypto: exynos-rng - Rename Exynos to lowercase

Fix up inconsistent usage of upper and lowercase letters in "Exynos"
name.

"EXYNOS" is not an abbreviation but a regular trademarked name.
Therefore it should be written with lowercase letters starting with
capital letter.

The lowercase "Exynos" name is promoted by its manufacturer Samsung
Electronics Co., Ltd., in advertisement materials and on website.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/Kconfig

@@ -430,7 +430,7 @@ config CRYPTO_DEV_SAHARA
 	  found in some Freescale i.MX chips.
 
 config CRYPTO_DEV_EXYNOS_RNG
-	tristate "EXYNOS HW pseudo random number generator support"
+	tristate "Exynos HW pseudo random number generator support"
 	depends on ARCH_EXYNOS || COMPILE_TEST
 	depends on HAS_IOMEM
 	select CRYPTO_RNG