esys: don't stringify ESYS_TCTI_DEFAULT_CONFIG
esys: don't stringify ESYS_TCTI_DEFAULT_CONFIG

The macro (like all other strings in config.h) is already quoted, so
using stringification will lead to a configuration string like

"/dev/tpmrm0"

(including the double quotes). Just use the macro directly instead like
ESYS_TCTI_DEFAULT_MODULE.

Fixes: GH-1395
Signed-off-by: Jonas Witschel <87a164e5d00d5dcdd001e37b34ea8bcd3fc3a172@gmx.de>

tpm2-software/tpm2-tss,01org/tpm2-tss,tpm2-software/tpm2-tss,01org/TPM2.0-TSS,tpm2-software/tpm2-tss,01org/TPM2.0-TSS,01org/TPM2.0-TSS,01org/TPM2.0-TSS,01org/tpm2-tss,01org/tpm2-tss