add support for WRS-LJ.

There are three types of wrs: normal wrs(mark as wrs), wrs with LJD (mark as WRS-LJD), wrs with embedded lowjitter circuits(mark as WRSLJ). lj_loopback_i/o is used to distinguish wrs from WRS-LJD and WRSLJ. lj_osc_freq_i is used to distinguish WRSLJ from WRS-LJD. lj_osc_freq_i=111 means WRSLJ. lj_osc_freq_i=others means WRS-LJD.

lj_osc_freq_i[2 downto 0] need to be pulled up

include/gpio-wrs.h

@@ -14,6 +14,9 @@
 #define GPIO_PLL_RESET_N	1
 #define GPIO_PERIPH_RESET_N	3
 #define GPIO_LJD_BOARD_DETECT	4
+#define GPIO_LJD_OSC_FREQ_0	5
+#define GPIO_LJD_OSC_FREQ_1	6
+#define GPIO_LJD_OSC_FREQ_2	7
 
 extern int ljd_present;