i2c-eg20t: include slab.h for memory allocations

Fixes (with v2.6.38-rc3/parisc/parisc-allmodconfig):
  src/drivers/i2c/busses/i2c-eg20t.c:720: error: implicit declaration of function 'kzalloc'
  src/drivers/i2c/busses/i2c-eg20t.c:790: error: implicit declaration of function 'kfree'

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Cc: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

drivers/i2c/busses/i2c-eg20t.c

@@ -29,6 +29,7 @@
 #include <linux/pci.h>
 #include <linux/mutex.h>
 #include <linux/ktime.h>
+#include <linux/slab.h>
 
 #define PCH_EVENT_SET	0	/* I2C Interrupt Event Set Status */
 #define PCH_EVENT_NONE	1	/* I2C Interrupt Event Clear Status */