reset: meson: make it explicitly non-modular

The Kconfig currently controlling compilation of this code is:

arch/arm/mach-meson/Kconfig:menuconfig ARCH_MESON
arch/arm/mach-meson/Kconfig:    bool "Amlogic Meson SoCs"

arch/arm64/Kconfig.platforms:config ARCH_MESON
arch/arm64/Kconfig.platforms:   bool "Amlogic Platforms"

...meaning that it currently is not being built as a module by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

Since module_platform_driver() uses the same init level priority as
builtin_platform_driver() the init ordering remains unchanged with
this commit.

Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code.

We also delete the MODULE_LICENSE tag etc. since all that information
was (or is now) contained at the top of the file in the comments.

Cc: Carlo Caione <carlo@caione.org>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: linux-amlogic@lists.infradead.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>