pcmcia/at91_cf: don't redefine SZ_2K

This fixes:

	drivers/pcmcia/at91_cf.c:55:1: warning: "SZ_2K" redefined

Since

	c1191b0e ([ARM] Kirkwood: create a mapping for the Security Accelerator SRAM)

SZ_2K is defined in arch/arm/include/asm/sizes.h.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

drivers/pcmcia/at91_cf.c

@@ -52,8 +52,6 @@ struct at91_cf_socket {
 	unsigned long		phys_baseaddr;
 };
 
-#define	SZ_2K			(2 * SZ_1K)
-
 static inline int at91_cf_present(struct at91_cf_socket *cf)
 {
 	return !gpio_get_value(cf->board->det_pin);