MAINTAINERS: Add Alain Volmat as STM32 I2C/SMBUS maintainer

Add Alain Volmat as STM32 I2C/SMBUS driver co-maintainer.
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: alain.volmat@foss.st.com
Link: https://lore.kernel.org/r/20210216074929.29033-4-patrice.chotard@foss.st.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

MAINTAINERS

@@ -16940,6 +16940,7 @@ F:	drivers/media/i2c/st-mipid02.c
 
 ST STM32 I2C/SMBUS DRIVER
 M:	Pierre-Yves MORDRET <pierre-yves.mordret@foss.st.com>
+M:	Alain Volmat <alain.volmat@foss.st.com>
 L:	linux-i2c@vger.kernel.org
 S:	Maintained
 F:	drivers/i2c/busses/i2c-stm32*