drm/i915/gt: Add helper for shmem copy to iosys_map

Add a variant of shmem_read() that takes a iosys_map pointer rather
than a plain pointer as argument. It's mostly a copy __shmem_rw() but
adapting the api and removing the write support since there's currently
only need to use iosys_map as destination.

Reworking __shmem_rw() to share the implementation was tempting, but
finding a good balance between reuse and clarity pushed towards a little
code duplication. Since the function is small, just add the similar
function with a copy/paste/adapt approach.

v2: Add an offset as argument and instead of using a map iterator, use the
offset to keep track of where we are writing data to.

Cc: Matt Roper <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Matthew Auld <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Signed-off-by: Lucas De Marchi <[email protected]>
Reviewed-by: Matt Atwood <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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