realtek: 6.6: copy patch 310-add-i2c-rtl9300-support

Copy the patch file to 6.6

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>

target/linux/realtek/patches-6.6/310-add-i2c-rtl9300-support.patch

@@ -0,0 +1,46 @@
+From 63a0a4d85bc900464c5b046b13808a582345f8c8 Mon Sep 17 00:00:00 2001
+From: Birger Koblitz <git@birger-koblitz.de>
+Date: Sat, 11 Dec 2021 20:14:47 +0100
+Subject: [PATCH] realtek: Add support for RTL9300/RTL9310 I2C controller
+
+This adds support for the RTL9300 and RTL9310 I2C controller.
+The controller implements the SMBus protocol for SMBus transfers
+over an I2C bus. The driver supports selecting one of the 2 possible
+SCL pins and any of the 8 possible SDA pins. Bus speeds of
+100kHz (standard speed) and 400kHz (high speed I2C) are supported.
+
+Submitted-by: Birger Koblitz <git@birger-koblitz.de>
+---
+ drivers/i2c/busses/Kconfig                    | 10 +++++++++
+ drivers/i2c/busses/Makefile                   |  1 +
+ 2 files changed, 11 insertions(+)
+
+--- a/drivers/i2c/busses/Kconfig
++++ b/drivers/i2c/busses/Kconfig
+@@ -949,6 +949,16 @@ config I2C_RK3X
+ 	  This driver can also be built as a module. If so, the module will
+ 	  be called i2c-rk3x.
+ 
++config I2C_RTL9300
++	tristate "Realtek RTL9300 I2C adapter"
++	depends on OF
++	help
++	  Say Y here to include support for the I2C adapter in Realtek RTL9300
++	  and RTL9310 SoCs.
++
++	  This driver can also be built as a module. If so, the module will
++	  be called i2c-rtl9300.
++
+ config HAVE_S3C2410_I2C
+ 	bool
+ 	help
+--- a/drivers/i2c/busses/Makefile
++++ b/drivers/i2c/busses/Makefile
+@@ -94,6 +94,7 @@ obj-$(CONFIG_I2C_QCOM_GENI)	+= i2c-qcom-
+ obj-$(CONFIG_I2C_QUP)		+= i2c-qup.o
+ obj-$(CONFIG_I2C_RIIC)		+= i2c-riic.o
+ obj-$(CONFIG_I2C_RK3X)		+= i2c-rk3x.o
++obj-$(CONFIG_I2C_RTL9300)	+= i2c-rtl9300.o
+ obj-$(CONFIG_I2C_S3C2410)	+= i2c-s3c2410.o
+ obj-$(CONFIG_I2C_SH7760)	+= i2c-sh7760.o
+ obj-$(CONFIG_I2C_SH_MOBILE)	+= i2c-sh_mobile.o