sbsa/scripts/sbsa.bb: Use $(...) notation instead of legacy backticks
sbsa/scripts/sbsa.bb: Use $(...) notation instead of legacy backticks

ShellCheck (and others) consider backticks to be a legacy feature
(https://github.com/koalaman/shellcheck/wiki/SC2006).

Update sbsa/scripts/sbsa.bb to use $(...) instead.

Signed-off-by: Rebecca Cran <0ab09b420c3f4f686e1f6503c93d3111d2038689@nuviainc.com>

ARM-software/arm-enterprise-acs,ARM-software/arm-enterprise-acs,ARM-software/arm-enterprise-acs