habanalabs/gaudi: Use correct sram size macro for debugfs

We currently allow accessing the whole SRAM bar size with
the macro SRAM_BAR_SIZE, but the actual size of the sram
region is the macro SRAM_SIZE which is only a portion of
the whole bar size. So when accessing the sram through
debugfs, use the macro SRAM_SIZE for the sram size
which is the correct macro.

Signed-off-by: Dafna Hirschfeld <dhirschfeld@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>