i2c: don't use any __deprecated handling anymore

This can be dropped with commit 771c0353
("deprecate the '__deprecated' attribute warnings entirely and for good")
now in upstream.

And we got rid of the last __deprecated use, too.
Signed-off-by: Sedat Dilek <sedat.dilek@credativ.de>
[wsa: shortened commit message to reflect the current situation]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/Makefile

@@ -18,4 +18,3 @@ obj-$(CONFIG_I2C_STUB)		+= i2c-stub.o
 obj-$(CONFIG_I2C_SLAVE_EEPROM)	+= i2c-slave-eeprom.o
 
 ccflags-$(CONFIG_I2C_DEBUG_CORE) := -DDEBUG
-CFLAGS_i2c-core-base.o := -Wno-deprecated-declarations