Revert incorrect start .text section left after experiments.

optiboot/bootloaders/optiboot/Makefile.extras

@@ -92,7 +92,7 @@ atmega32_isp: isp
 attiny84: TARGET = attiny84
 attiny84: MCU_TARGET = attiny84
 attiny84: CFLAGS += $(COMMON_OPTIONS) -DSOFT_UART -DVIRTUAL_BOOT_PARTITION -Dsave_vect_num=4
-attiny84: LDSECTIONS = -Wl,--section-start=.text=0x1c00 -Wl,--section-start=.version=0x1ffe -Wl,--gc-sections -Wl,--undefined=optiboot_version
+attiny84: LDSECTIONS = -Wl,--section-start=.text=0x1d00 -Wl,--section-start=.version=0x1ffe -Wl,--gc-sections -Wl,--undefined=optiboot_version
 attiny84: $(PROGRAM)_attiny84.hex
 attiny84: $(PROGRAM)_attiny84.lst