OMAP: Enable Magic SysRq on serial console ttyOx

Magic SysRq key is not working for OMAP on new serial
console ttyOx because SUPPORT_SYSRQ is not defined
for omap-serial.

This patch defines SUPPORT_SYSRQ in omap-serial and
enables handling of Magic SysRq character.

Further there is an issue of losing first break character.
Removing the reset of the lsr_break_flag fixes this issue.
Signed-off-by: NThomas Weber <weber@corscience.de>
Acked-by: NGovindraj.R <govindraj.raja@ti.com>
Tested-by: NManjunath G Kondaiah <manjugk@ti.com>
Acked-by: NKevin Hilman <khilman@ti.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/tty/serial/omap-serial.c

@@ -20,6 +20,10 @@
  * this driver as required for the omap-platform.
  */
 
+#if defined(CONFIG_SERIAL_OMAP_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/console.h>
@@ -190,7 +194,6 @@ static inline void receive_chars(struct uart_omap_port *up, int *status)
 			if (up->port.line == up->port.cons->index) {
 				/* Recover the break flag from console xmit */
 				lsr |= up->lsr_break_flag;
-				up->lsr_break_flag = 0;
 			}
 #endif
 			if (lsr & UART_LSR_BI)