gpio: xilinx: add missing blank line after declarations

Add a missing blank line. No functional changes.

WARNING: Missing a blank line after declarations
128: FILE: drivers/gpio/gpio-xilinx.c:120:
+       void __iomem *addr = chip->regs + reg + xgpio_regoffset(chip, bit / 32);
+       xgpio_set_value32(a, bit, xgpio_readreg(addr));

WARNING: Missing a blank line after declarations
136: FILE: drivers/gpio/gpio-xilinx.c:126:
+       void __iomem *addr = chip->regs + reg + xgpio_regoffset(chip, bit / 32);
+       xgpio_writereg(addr, xgpio_get_value32(a, bit));

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Reviewed-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>