MLK-15027: arm: pxp: Fix uninitialized use of variables

MLK-15027: arm: pxp: Fix uninitialized use of variables

This patch fixes build warning that 2 variables may be used uninitialized
in the pxp_fetch_config() function in drivers/dma/pxp/pxp_dma_v3.c .

The variables in_fmt and out_fmt are passed as parameters to
pxp_fetch_shift_calc() only if shift_bypass is false. This flag cannot be
false unless changed in a code block that also assigns in_fmt and out_fmt.

Since the compiler cannot detect this flow, it shows a warning that in_fmt
and out_fmt are not initialized. Fix this by changing the code flow such
that in_fmt and out_fmt are sent as parameters in the same code block where
they are assigned.

Signed-off-by: Cristina Ciocan <cristina-mihaela.ciocan@nxp.com>