Kconfig: convert CONFIG_SYS_I2C_LPC32XX

Convert the CONFIG_SYS_I2C_LPC32XX configuration symbol from an include
directive to a Kconfig value.

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index ce0d796..41065dd 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -169,6 +169,12 @@
 	help
 	  Add support for the NXP i.MX LPI2C driver.
 
+config SYS_I2C_LPC32XX
+	bool "LPC32XX I2C driver"
+	depends on ARCH_LPC32XX
+	help
+	  Enable support for the LPC32xx I2C driver.
+
 config SYS_I2C_MESON
 	bool "Amlogic Meson I2C driver"
 	depends on DM_I2C && ARCH_MESON