arch/arc: explicitly set "max-page-size" for GNU LD

arch/arc: explicitly set "max-page-size" for GNU LD

Back in the day we relied on a default value that used to be 8KiB
and it worked perfectly fine for ARC's default 8KiB page as well as
4 KiB ones, but not for 16 KiB, see [1] for more details.

So that we fixed by setting "max-page-size" if 16KiB pages are in use by
commit d024d369b82d2 ("arch/arc: Accommodate 16 KiB MMU pages").

But as Yann very rightfully mentioned here [2] we should be setting this
thing explicitly for all page sizes because:
 1. Defaults might change unexpectedly
 2. Explicitly set stuff is better understood
 3. We act similarly to all settings but not only addressing some corner cases

[1] https://git.buildroot.org/buildroot/commit/?id=d024d369b82d2d3d9d4d75489c19e9488202bca0
[2] https://patchwork.ozlabs.org/patch/1212544/#2330647

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>