rockchip: rng: add trngv1 for rk3588

This adds support for the TRNG found in the RK3588 SoC to the
rockchip_rng driver so that it can be used for things such as
seeding randomness to Linux.

Changes in V3:
 - Moved notes from commit to cover letter.
 - Added Reviewed-By tag.

Changes in V2:
 - Modified Kconfig to note that the Rockchip RNG driver supports all
   versions of the hardware (v1, v2, and the trng in the rk3588).

Signed-off-by: Lin Jinhan <troy.lin@rock-chips.com>
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/rng/Kconfig b/drivers/rng/Kconfig
index 5dcf681..5deb5db 100644
--- a/drivers/rng/Kconfig
+++ b/drivers/rng/Kconfig
@@ -58,8 +58,9 @@
 	bool "Enable random number generator for rockchip crypto rng"
 	depends on ARCH_ROCKCHIP && DM_RNG
 	help
-	  Enable random number generator for rockchip.This driver is
-	  support rng module of crypto v1 and crypto v2.
+	  Enable random number generator for rockchip. This driver
+	  supports the rng module of crypto v1, crypto v2, and the
+	  trng module of the rk3588 series.
 
 config RNG_IPROC200
 	bool "Broadcom iProc RNG200 random number generator"