Hello Pramod,
I've checked interface config guide for IOS XR 3.7
that is here
http://www.cisco.com/en/US/partner/docs/ios_xr_sw/iosxr_r3.7/interfaces/configuration/guide/hc37ethi.html#wp1087155
change partner in customer if the link doesn't work for you
there is no mention of media type I wonder if :
a) it is auto-sense and uses the one with link
or
b) this specific SPA is not supported in IOS XR
it says
Release 3.4.1
Support was added on the Cisco XR 12000 Series Router for the 2-Port Gigabit Ethernet SPA.
so it should be supported
Hope to help
Giuseppe