phy: phy-bcm-ns2-usbdrd: Constify phy_ops

phy_ops are never modified and can therefore be made const to allow the
compiler to put it in read-only memory.

Before:
text data bss dec hex filename
7831 3144 128 11103 2b5f drivers/phy/broadcom/phy-bcm-ns2-usbdrd.o

After:
text data bss dec hex filename
7959 3016 128 11103 2b5f drivers/phy/broadcom/phy-bcm-ns2-usbdrd.o

Signed-off-by: Rikard Falkeborn <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

drivers/phy/broadcom/phy-bcm-ns2-usbdrd.c

···
 	return IRQ_HANDLED;
 }
 
-static struct phy_ops ops = {
+static const struct phy_ops ops = {
 	.init		= ns2_drd_phy_init,
 	.power_on	= ns2_drd_phy_poweron,
 	.power_off	= ns2_drd_phy_poweroff,