misc: fastrpc: Rename phys to dma_addr for clarity

misc: fastrpc: Rename phys to dma_addr for clarity

The fields buf->phys and map->phys currently store DMA addresses
returned by dma_map_*() APIs, not physical addresses. This naming
is misleading and may lead to incorrect assumptions about the
address type and its translation.
Rename these fields from phys to dma_addr to improve code clarity
and align with kernel conventions for dma_addr_t usage.

Signed-off-by: Kumari Pallavi <kumari.pallavi@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://patch.msgid.link/20251226070534.602021-3-kumari.pallavi@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>