Merge branch 'guard' into 'debian/master'

Guard defines in rsi_sdio.h

See merge request !2
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librem5
package:deb-debian-buster

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passed #304099
librem5
package:deb-debian-buster

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  Test Package
passed #307778
librem5
lintian-debian-buster-package

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passed #304100
librem5
lintian-debian-buster-package

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