ARM: MediaTek: amend IC description for MediaTek MT8512

The description for MT8512  has some mistake, so correct it.

Signed-off-by: Mingming Lee <Mingming.Lee@mediatek.com>
diff --git a/arch/arm/mach-mediatek/Kconfig b/arch/arm/mach-mediatek/Kconfig
index 0042e57..7f40ba9 100644
--- a/arch/arm/mach-mediatek/Kconfig
+++ b/arch/arm/mach-mediatek/Kconfig
@@ -47,10 +47,10 @@
         select ARM64
 	select MT8512
         help
-          The MediaTek MT8512 is a ARM64-based SoC with a quad-core Cortex-A53.
+          The MediaTek MT8512 is a ARM64-based SoC with a dual-core Cortex-A53.
           including UART, SPI, USB2.0 and OTG, SD and MMC cards, NAND, PWM,
-          Ethernet, IR TX/RX, I2C, I2S, S/PDIF, and built-in Wi-Fi / Bluetooth combo
-          chip and several DDR3 and DDR4 options.
+          IR RX, I2C, I2S, S/PDIF, and built-in Wi-Fi / Bluetooth digital
+          and several LPDDR3 and LPDDR4 options.
 
 config TARGET_MT8516
 	bool "MediaTek MT8516 SoC"