net: rmnet_data: Remove redundant uapi installation

UAPI is automatically installed now, so we can remove the unnecessary
change in Kbuild.

CRs-Fixed: 2086060
Change-Id: If3e657cd0bc013a1905bf5f59e2d2ced2994f564
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>