Fix CFLAGS in Makefile (#1562)
Fix CFLAGS in Makefile (#1562)

Noticed a typo in ESP32 demo Makefile which likely explains why are
builds are unexpectedly large.
project-chip/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip