refactor(build): make it standard to request a custom linker script

Hoist the add_define to a global location so that platforms only have to
declare its usage. Fix up #ifdef to #if since we will now

refactor(build): make it standard to request a custom linker script

Hoist the add_define to a global location so that platforms only have to
declare its usage. Fix up #ifdef to #if since we will now always pass a
definition.

Change-Id: Ia52ad5ed4dcbd157d139c8ca2fb3d35b32343b93
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>

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refactor(platforms): remove usage of psci_power_down_wfi

The callers in PSCI will now call wfi() after calling the
pwr_domain_pwr_down() platform hook (previously they were mutually
exclusive). As s

refactor(platforms): remove usage of psci_power_down_wfi

The callers in PSCI will now call wfi() after calling the
pwr_domain_pwr_down() platform hook (previously they were mutually
exclusive). As such, there is no need for platforms to do this
themselves. In fact, it is strongly advisable for platforms not to do
this themselves so that the PSCI can apply any relevant errata
mitigations.

Change-Id: Ic9702edef7503996be24d984e29dfcc13bc3fcba
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>

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feat(rk3576): support rk3576

rk3576 is an Octa-core soc with Cortex-a53/a72 inside.
This patch supports the following functions:
1. basic platform setup
2. power up/off cpus
3. suspend/resume cpus
4

feat(rk3576): support rk3576

rk3576 is an Octa-core soc with Cortex-a53/a72 inside.
This patch supports the following functions:
1. basic platform setup
2. power up/off cpus
3. suspend/resume cpus
4. suspend/resume system
5. reset system
6. power off system

Change-Id: I67a019822bd4af13e4a3cdd09cf06202f4922cc4
Signed-off-by: XiaoDong Huang <derrick.huang@rock-chips.com>

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