efi/libstub/arm64: Use hidden attribute for struct screen_info reference
To prevent the compiler from emitting absolute references to screen_info when building position independent code, redeclare the symbol with hidden visibility. Tested-by: NMatthias Kaehlcke <mka@chromium.org> Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20170818194947.19347-3-ard.biesheuvel@linaro.orgSigned-off-by: NIngo Molnar <mingo@kernel.org>
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