soc: qcom: glink_spi_xprt: Fix compilation error for 32 bit

Conversion of a 64 bit int variable to void pointer is illegal
operation when compiling for 32 bit architecture.

Added explicit conversion to uintprt_t, so that 32 bit conversion
can be done.

CRs-Fixed: 1107920
Change-Id: I3854fcb460308c9a77a17198dcb604dd4da135ac
Signed-off-by: Dhoat Harpal <hdhoat@codeaurora.org>