clk: sunxi: Do not select the PRCM MFD

The PRCM MFD driver is already selected by the two platforms where it is
actually used (MACH_SUN6I and MACH_SUN8I). Selecting it here builds it
unnecessarily on the rest of the Allwinner platforms.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20220702190135.51744-2-samuel@sholland.org

clk: sunxi: Limit legacy clocks to 32-bit ARM

The sunxi legacy clocks were never compatible with any 64-bit SoC,
so there is no point in building them as part of a 64-bit ARM kernel.
They make even less sense being built in to a 64-bit RISC-V kernel.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20220702190135.51744-1-samuel@sholland.org

treewide: Add SPDX license identifier - Makefile/Kconfig

Add SPDX license identifiers to all Make/Kconfig files which:

- Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

GPL-2.0-only

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

clk: sunxi: Add Kconfig options

We used to have a clock framework that isn't really used these days, except
for a few clocks and/or SoCs. Most of the time, the new framework and
drivers (sunxi-ng) will provide everything needed for the customer devices
to operate properly.

Since we're not needing it that much, it might make sense to disable those
drivers, for example when we want to reduce the kernel size. Let's add
options in Kconfig that can be disabled if needed, but are still on by
default to keep the same features in the standard case.

Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>