MAINTAINERS: update lpc18xx entry with more drivers

Add explicit entries for drivers used by the lpc18xx that is
not caught by the "lpc18xx" regex pattern.
Signed-off-by: NJoachim Eastwood <manabian@gmail.com>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

MAINTAINERS

@@ -1230,6 +1230,13 @@ ARM/LPC18XX ARCHITECTURE
 M:	Joachim Eastwood <manabian@gmail.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
+F:	arch/arm/boot/dts/lpc43*
+F:	drivers/clk/nxp/clk-lpc18xx*
+F:	drivers/clocksource/time-lpc32xx.c
+F:	drivers/i2c/busses/i2c-lpc2k.c
+F:	drivers/memory/pl172.c
+F:	drivers/mtd/spi-nor/nxp-spifi.c
+F:	drivers/rtc/rtc-lpc24xx.c
 N:	lpc18xx
 
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